期刊
EXPERT REVIEW OF GASTROENTEROLOGY & HEPATOLOGY
卷 7, 期 8, 页码 733-748出版社
TAYLOR & FRANCIS LTD
DOI: 10.1586/17474124.2013.848790
关键词
alternative lengthening of telomeres; cancer; cancer risk; telomerase; telomere maintenance genes; telomeres; TERT
资金
- National Cancer Institute [RO-1 CA132718, RO-1 CA 170357]
- National Institute of Diabetes and Digestive and Kidney Diseases [P30 DK084567]
Aberrations in telomere length and telomere maintenance contribute to cancer development. In this article, we review the basic principles of telomere length in normal and tumor tissue and the presence of the two main telomere maintenance pathways as they pertain to gastrointestinal tract cancer. Peripheral blood telomeres are shorter in patients with many types of gastrointestinal tract cancers. Telomere length in tumor DNA also appears to shorten early in cancer development. Tumor telomere shortening is often accompanied by telomerase activation to protect genetically damaged DNA from normal cell senescence or apoptosis, allowing immortalized but damaged DNA to persist. Alternative lengthening of telomeres is another mechanism used by cancer to maintain telomere length in cancer cells. Telomerase and alternative lengthening of telomeres activators and inhibitors may become important chemopreventive or chemotherapeutic agents as our understanding of telomere biology, specific telomere-related phenotypes and its relationship to carcinogenesis increases.
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